F'heit    Celsius
-----------------
  -100     -73.33
   -80     -62.22
   -60     -51.11
   -40     -40.00
   -20     -28.89
     0     -17.78
    20      -6.67
    40       4.44
    60      15.56
    80      26.67
   100      37.78
   120      48.89
   140      60.00
   160      71.11
   180      82.22
   200      93.33
